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Positively-charged plasmonic nanostructures for SERS sensing applications.

Mariacristina Turino1, Nicolas Pazos-Perez1, Luca Guerrini1

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Positively charged plasmonic materials enhance surface-enhanced Raman (SERS) spectroscopy by improving the detection of negatively charged molecules. This review explores methods for creating these advanced SERS platforms.

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Spectroscopy

Background:

  • Surface-enhanced Raman (SERS) spectroscopy is a highly sensitive analytical method.
  • Current plasmonic materials often have negative surface charges, limiting the detection of negatively charged analytes.
  • Tailoring plasmonic materials is key to advancing SERS applications.

Purpose of the Study:

  • To review methods for creating positively charged plasmonic platforms.
  • To discuss the application of these platforms in SERS sensing.
  • To address the limitations of conventional negatively charged SERS materials.

Main Methods:

  • Modification of metallic surfaces with various surface ligands.
  • Imparting positive charges to plasmonic materials.
  • Utilizing cationic amines for surface charge modification due to their stability and accessibility.

Main Results:

  • Development of strategies to generate positively charged plasmonic platforms.
  • Demonstration of enhanced analyte adhesion and SERS signal for negatively charged species.
  • Highlighting the versatility and effectiveness of cationic amine modifications.

Conclusions:

  • Positively charged plasmonic materials significantly improve SERS sensitivity, especially for anionic analytes.
  • Surface modification with cationic amines offers a robust and adaptable approach for advanced SERS sensing.
  • This review provides a comprehensive overview of positively charged SERS platforms and their applications.